/*
silverPDF is sponsored by Aleyant Systems (http://www.aleyant.com)

silverPDF is based on PdfSharp (http://www.pdfsharp.net) and iTextSharp (http://itextsharp.sourceforge.net)

Developers: Ai_boy (aka Oleksii Okhrymenko)

Permission is hereby granted, free of charge, to any person
obtaining a copy of this software and associated documentation
files (the "Software"), to deal in the Software without
restriction, including without limitation the rights to use,
copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following
conditions:

The above information and this permission notice shall be
included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR SPONSORS
BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.

*/
#region PDFsharp - A .NET library for processing PDF
//
// Authors:
//   Stefan Lange (mailto:Stefan.Lange@pdfsharp.com)
//
// Copyright (c) 2005-2008 empira Software GmbH, Cologne (Germany)
//
// http://www.pdfsharp.com
// http://sourceforge.net/projects/pdfsharp
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 
// DEALINGS IN THE SOFTWARE.
#endregion

using System;
using System.Diagnostics;
using System.Collections.Generic;
using System.Text;
using System.Globalization;

#pragma warning disable 1591


namespace PdfSharp.Internal
{
  // Relected from WPF to ensure compatibility
  // Use netmassdownloader -d "C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\v3.0" -output g:\cachetest -v
  public class TokenizerHelper
  {
    internal char PeekNextCharacter()
    {
      if (this.charIndex >= this.strLen)
        return 'X';
      char ch = this.str[this.charIndex];
      return ch;
    }

    static IFormatProvider NeutralCulture = new CultureInfo("en-us");
      

    public TokenizerHelper(string str)
      : this(str, NeutralCulture)
    { }

    public TokenizerHelper(string str, IFormatProvider formatProvider)
    {
      char numericListSeparator = GetNumericListSeparator(formatProvider);
      Initialize(str, '\'', numericListSeparator);
    }

    public TokenizerHelper(string str, char quoteChar, char separator)
    {
      this.Initialize(str, quoteChar, separator);
    }

    internal string GetCurrentToken()
    {
      if (this.currentTokenIndex < 0)
        return null;
      return this.str.Substring(this.currentTokenIndex, this.currentTokenLength);
    }

    internal static char GetNumericListSeparator(IFormatProvider provider)
    {
      char ch = ',';
      NumberFormatInfo instance = NumberFormatInfo.GetInstance(provider);
      if (instance.NumberDecimalSeparator.Length > 0 && ch == instance.NumberDecimalSeparator[0])
        ch = ';';
      return ch;
    }

    private void Initialize(string str, char quoteChar, char separator)
    {
      this.str = str;
      this.strLen = (str == null) ? 0 : str.Length;
      this.currentTokenIndex = -1;
      this.quoteChar = quoteChar;
      this.argSeparator = separator;
      while (this.charIndex < this.strLen)
      {
        if (!Char.IsWhiteSpace(this.str, this.charIndex))
          return;
        this.charIndex++;
      }
    }

    internal void LastTokenRequired()
    {
      if (this.charIndex != this.strLen)
        throw new InvalidOperationException("Extra data encountered"); //SR.Get(SRID.TokenizerHelperExtraDataEncountered, new object[0]));
    }

    internal bool NextToken()
    {
      return this.NextToken(false);
    }

    internal bool NextToken(bool allowQuotedToken)
    {
      return this.NextToken(allowQuotedToken, this.argSeparator);
    }

    internal bool NextToken(bool allowQuotedToken, char separator)
    {
      this.currentTokenIndex = -1;
      this.foundSeparator = false;
      if (this.charIndex >= this.strLen)
        return false;

      char c = this.str[this.charIndex];
      int charCount = 0;
      if (allowQuotedToken && c == this.quoteChar)
      {
        charCount++;
        this.charIndex++;
      }
      int index = this.charIndex;
      int num3 = 0;
      while (this.charIndex < this.strLen)
      {
        c = this.str[this.charIndex];
        if (charCount > 0)
        {
          if (c != this.quoteChar)
            goto Label_00AA;

          charCount--;
          if (charCount != 0)
            goto Label_00AA;

          this.charIndex++;
          break;
        }
        if (char.IsWhiteSpace(c) || c == separator)
        {
          if (c == separator)
            this.foundSeparator = true;
          break;
        }
      Label_00AA:
        this.charIndex++;
        num3++;
      }
      if (charCount > 0)
        throw new InvalidOperationException("Missing end quote"); //SR.Get(SRID.TokenizerHelperMissingEndQuote, new object[0]));
      this.ScanToNextToken(separator);
      this.currentTokenIndex = index;
      this.currentTokenLength = num3;
      if (this.currentTokenLength < 1)
        throw new InvalidOperationException("Empty token"); // SR.Get(SRID.TokenizerHelperEmptyToken, new object[0]));
#if DEBUG_
      string s = GetCurrentToken();
      if (s == "169.466971230985")
        Debugger.Break();
      //Debug.WriteLine(GetCurrentToken());
#endif
      return true;
    }

    public string NextTokenRequired()
    {
      if (!NextToken(false))
        throw new InvalidOperationException("PrematureStringTermination"); //SR.Get(SRID.TokenizerHelperPrematureStringTermination, new object[0]));
      return GetCurrentToken();
    }

    public string NextTokenRequired(bool allowQuotedToken)
    {
      if (!NextToken(allowQuotedToken))
        throw new InvalidOperationException("PrematureStringTermination");  //SR.Get(SRID.TokenizerHelperPrematureStringTermination, new object[0]));
      return GetCurrentToken();
    }

    private void ScanToNextToken(char separator)
    {
      if (this.charIndex < this.strLen)
      {
        char c = this.str[this.charIndex];
        if (c != separator && !char.IsWhiteSpace(c))
        {
          throw new InvalidOperationException("ExtraDataEncountered"); //SR.Get(SRID.TokenizerHelperExtraDataEncountered, new object[0]));
        }
        int num = 0;
        while (this.charIndex < this.strLen)
        {
          c = this.str[this.charIndex];
          if (c == separator)
          {
            this.foundSeparator = true;
            num++;
            this.charIndex++;
            if (num > 1)
              throw new InvalidOperationException("EmptyToken"); //SR.Get(SRID.TokenizerHelperEmptyToken, new object[0]));
          }
          else
          {
            if (!char.IsWhiteSpace(c))
              break;
            this.charIndex++;
          }
        }
        if (num > 0 && this.charIndex >= this.strLen)
          throw new InvalidOperationException("EmptyToken"); // SR.Get(SRID.TokenizerHelperEmptyToken, new object[0]));
      }
    }

    internal bool FoundSeparator
    {
      get { return this.foundSeparator; }
    }
    private bool foundSeparator;

    private char argSeparator;
    private int charIndex;
    internal int currentTokenIndex;
    internal int currentTokenLength;
    private char quoteChar;
    private string str;
    private int strLen;
  }
}